Description: Bamboo Pro supports are made with Activated Bamboo Charcoal that offers natural self-heating & cooling technology. It activates with your body temperature to heat up or cool down to relieve sore muscles, soothe achy joints, improve flexibility, enhance performance, speed up recovery, and other related issues. Bamboo Pro supports are breathable, durable, and absorb odor & moisture. Can be worn all day or night. Bamboo charcoal will last a lifetime and can be renewed in sunlight. Available sizes: XS, S, M & L.